Preparing method and application of corn stalk core hemicellulose-based hydrophobic temperature-sensitive gel

A technology of hemicellulose and corn stalks, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve problems such as limitations, lack of large-scale chemical industry applications, and reduced application value of corn stalks. Achieve high-efficiency adsorption and desorption performance and high reuse times

Active Publication Date: 2017-11-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of corn stalks (also known as corn stalks) in the fiber industry has been severely limited due to the fact that most of the constituent cells are short, thin-walled, and fragile non-fibrous cells (or called miscellaneous cells). Reduced app

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

[0019] Embodiment 1: The preparation method of hemicellulose hydrophobic temperature-sensitive gel based on corn straw, the specific operation is as follows:

[0020] (1) Preparation of corn stalks

[0021]The corn stalks are air-dried, and the moisture content of the air-dried raw materials is 5%. After manual peeling, the stalks are subjected to mechanical grinding treatment, and then screened by a 60-mesh but no more than 100-mesh screen to be qualified raw materials;

[0022] (2) Separation of hemicellulose from corn stover

[0023] The conditions of hemicellulose extraction are as follows: the amount of potassium hydroxide is 1.0% of the absolute dry raw material mass, the ratio of water to absolute dry raw material mass in the system is 5g:1g, the reaction time is 0.5h, and the treatment temperature is 120°C.

[0024] The specific operation steps are as follows: 10.0g of absolutely dried straw raw material (if the moisture content of the air-dried raw material is 5%, th...

Example Embodiment

[0033] Embodiment 2: Based on the preparation method of corn straw hemicellulose hydrophobic temperature-sensitive gel, the specific operations are as follows:

[0034] (1) Preparation of corn stalks

[0035] The corn stalks are air-dried, wherein the moisture content of the air-dried raw materials is 20%. After manual peeling, the stalks are subjected to mechanical grinding treatment, and then screened by a 100-mesh but not 200-mesh screen to be qualified raw materials;

[0036] (2) Separation of hemicellulose from corn stover

[0037] The conditions of hemicellulose extraction are as follows: the amount of potassium hydroxide is 8.0% of the absolute dry raw material mass, the ratio of water in the system to the absolute dry raw material mass is 10g:1g, the reaction time is 2.0h, and the treatment temperature is 170°C.

[0038] The specific operation steps are as follows: 10.0g of absolutely dried straw raw material (if the moisture content of the air-dried raw material is 2...

Example Embodiment

[0047] Embodiment 3: Based on the preparation method of corn straw hemicellulose hydrophobic temperature-sensitive gel, the specific operations are as follows:

[0048] (1) Preparation of corn stalks

[0049] The corn stalks are air-dried, wherein the moisture content of the air-dried raw materials is 30%. After manual peeling, the stalks are subjected to mechanical grinding treatment, and then screened by a 200-mesh but less than 300-mesh screen to be qualified raw materials;

[0050] (2) Separation of hemicellulose from corn stover

[0051] The conditions of hemicellulose extraction are as follows: the amount of potassium hydroxide is 10.0% of the mass of the absolute dry raw material, the ratio of the amount of water in the system to the mass of the absolute dry raw material is 15g:1g, the reaction time is 3.0h, and the treatment temperature is 200°C.

[0052] The specific operation steps are as follows: 10.0g of absolutely dried straw raw material (if the moisture content...

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PUM

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Abstract

The invention discloses a preparing method of corn stalk core hemicellulose-based hydrophobic temperature-sensitive gel. The method includes the steps of peeling, grinding and screening air-dried corn stalk to obtain a qualified raw material, separating out hemicellulose in the qualified raw material through an alkali-assistant hot water extraction technology, grafting and copolymerizing N-isopropylacrylamide and phenyl methacrylate on a hemicellulose macromolecular chain through a water solution micelle polymerization method, and carrying out a cross-linking reaction with N,N-methylenebis acrylamide to obtain the corn stalk core hemicellulose-based hydrophobic temperature-sensitive hydrogel. The prepared gel is white and massive, has high adsorption capacity for chlorophenasic acid, pentachlorodiphenyl and 3,4-benzopyrene, can be repeatedly used without losing the adsorption efficiency by controlling adsorption and desorption effects through temperature, and belongs to an environment-friendly type hydrophobic organic pollutant temperature-control adsorption material.

Description

technical field [0001] The invention relates to a temperature-sensitive gel prepared by hemicellulose graft copolymerization hydrophobic modification based on corn stalks, which is used for the adsorption treatment of hydrophobic organic pollutants and belongs to the technical field of natural polymer modified materials. Background technique [0002] With the rapid development of my country's chemical industry, a large amount of industrial wastewater, especially persistent organic pollutants, is directly discharged into water bodies without treatment, leading to increasingly serious water environmental pollution and causing great harm to human health. Many organic pollutants, such as polycyclic aromatic hydrocarbons, aromatic compounds, polychlorinated biphenyls, etc., are hydrophobic, so these pollutants are also called hydrophobic organic pollutants (HOCs). Most HOCs have carcinogenic, teratogenic, and mutagenic effects, can accumulate in organisms, and eventually pose hea...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/54C08F222/38C08F220/18C08F2/26C08B37/14B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/28047C02F1/286C08B37/0057C08F2/26C08F251/00C08F220/54C08F222/385C08F220/18
Inventor 高欣李俊慧张恒
Owner KUNMING UNIV OF SCI & TECH
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